Dragons

After Heather's betrayal leaves the Book of Dragons in the hands of the Outcasts, the kids devise a plan for Astrid to disguise herself as Heather, sneak onto Outcast Island, and retrieve the book from Alvin and the Outcasts.

For his entire life, Snotlout has been beating Hiccup and the others in the Thawfest games. But this year, the games include dragon-based events, and Hiccup is determined to finally win.

When a series of lightning storms hit Berk, Mildew claims Thor is angry at the village for allowing Toothless, a Night Fury, to live among them. Hiccup must prove Toothless's innocence as he and Stoick face an uprising against Toothless.

A rogue dragon - a Whispering Death - shows up in Berk, tearing up the village. He's on a mission - to find Toothless and settle a score.

When Ruffnut and Tuffnut have a falling out, Hiccup and the kids must reunite them before their wayward Zippleback is discovered by Dagur the Deranged, the visiting chief from the fearsome Berserker tribe.

Hiccup and Snotlout face difficulties getting home from Outcast Island.

The gang visit a haunted bog to retrieve a lost gift for Hiccup.

Fishlegs discovers a gem that is of great value to a flock of dangerous Changewings.

With Bork Day, the annual holiday celebrating the village's history, fast approaching, Stoick bestows Hiccup with all of Bork's notes and studies on dragons.

Conclusion. Hiccup and Toothless hatch an escape plan after being trapped on Outcast Island.